Eucalypts are widely grown throughout the world for timber, essential oil, fuel, biomass and cut foliage. In experiments in University College Dublin (UCD), Eucalyptus gunnii yielded an average dry weight of 4.74 kg per plant per annum, equivalent to 12.59 t dm ha(-1). The average calorific values of 17.60 MJ kg(-1) (leafy material) and 17.09 MJ kg(-1) (woody material) are less than the values reported for other species of Eucalyptus. (c) 2008 Elsevier Ltd. All rights reserved.